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Java library for Javascript Object Signing and Encryption (JOSE) and JSON Web Tokens (JWT)

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/*
 * nimbus-jose-jwt
 *
 * Copyright 2012-2016, Connect2id Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the
 * License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed
 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */

package com.nimbusds.jose.crypto;


import com.nimbusds.jose.CriticalHeaderParamsAware;
import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWSHeader;
import com.nimbusds.jose.JWSVerifier;
import com.nimbusds.jose.crypto.impl.CriticalHeaderParamsDeferral;
import com.nimbusds.jose.crypto.impl.RSASSA;
import com.nimbusds.jose.crypto.impl.RSASSAProvider;
import com.nimbusds.jose.jwk.RSAKey;
import com.nimbusds.jose.util.Base64URL;
import net.jcip.annotations.ThreadSafe;

import java.security.InvalidKeyException;
import java.security.Signature;
import java.security.SignatureException;
import java.security.interfaces.RSAPublicKey;
import java.util.Objects;
import java.util.Set;


/**
 * RSA Signature-Scheme-with-Appendix (RSASSA) verifier of 
 * {@link com.nimbusds.jose.JWSObject JWS objects}. Expects a public RSA key.
 *
 * 

See RFC 7518, sections * 3.3 and * 3.5 for more * information. * *

This class is thread-safe. * *

Supports the following algorithms: * *

    *
  • {@link com.nimbusds.jose.JWSAlgorithm#RS256} *
  • {@link com.nimbusds.jose.JWSAlgorithm#RS384} *
  • {@link com.nimbusds.jose.JWSAlgorithm#RS512} *
  • {@link com.nimbusds.jose.JWSAlgorithm#PS256} *
  • {@link com.nimbusds.jose.JWSAlgorithm#PS384} *
  • {@link com.nimbusds.jose.JWSAlgorithm#PS512} *
* *

Supports the BouncyCastle FIPS provider for the PSxxx family of JWS algorithms. * * @author Vladimir Dzhuvinov * @version 2024-04-20 */ @ThreadSafe public class RSASSAVerifier extends RSASSAProvider implements JWSVerifier, CriticalHeaderParamsAware { /** * The critical header policy. */ private final CriticalHeaderParamsDeferral critPolicy = new CriticalHeaderParamsDeferral(); /** * The public RSA key. */ private final RSAPublicKey publicKey; /** * Creates a new RSA Signature-Scheme-with-Appendix (RSASSA) verifier. * * @param publicKey The public RSA key. Must not be {@code null}. */ public RSASSAVerifier(final RSAPublicKey publicKey) { this(publicKey, null); } /** * Creates a new RSA Signature-Scheme-with-Appendix (RSASSA) verifier. * * @param rsaJWK The RSA JSON Web Key (JWK). Must not be {@code null}. * * @throws JOSEException If the RSA JWK extraction failed. */ public RSASSAVerifier(final RSAKey rsaJWK) throws JOSEException { this(rsaJWK.toRSAPublicKey(), null); } /** * Creates a new RSA Signature-Scheme-with-Appendix (RSASSA) verifier. * * @param publicKey The public RSA key. Must not be {@code null}. * @param defCritHeaders The names of the critical header parameters * that are deferred to the application for * processing, empty set or {@code null} if none. */ public RSASSAVerifier(final RSAPublicKey publicKey, final Set defCritHeaders) { this.publicKey = Objects.requireNonNull(publicKey); critPolicy.setDeferredCriticalHeaderParams(defCritHeaders); } /** * Gets the public RSA key. * * @return The public RSA key. */ public RSAPublicKey getPublicKey() { return publicKey; } @Override public Set getProcessedCriticalHeaderParams() { return critPolicy.getProcessedCriticalHeaderParams(); } @Override public Set getDeferredCriticalHeaderParams() { return critPolicy.getDeferredCriticalHeaderParams(); } @Override public boolean verify(final JWSHeader header, final byte[] signedContent, final Base64URL signature) throws JOSEException { if (! critPolicy.headerPasses(header)) { return false; } final Signature verifier = RSASSA.getSignerAndVerifier(header.getAlgorithm(), getJCAContext().getProvider()); try { verifier.initVerify(publicKey); } catch (InvalidKeyException e) { throw new JOSEException("Invalid public RSA key: " + e.getMessage(), e); } try { verifier.update(signedContent); return verifier.verify(signature.decode()); } catch (SignatureException e) { return false; } } }





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